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T-SQL
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SSSolice
SSSolice
Posted Wednesday, January 06, 2010 10:39 PM
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Group: General Forum Members
Last Login: Friday, September 09, 2011 8:51 AM
Points: 291,
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Comments posted to this topic are about the item
T-SQL
Post #843310
SQLRNNR
SQLRNNR
Posted Wednesday, January 06, 2010 11:09 PM
SSCoach
Group: General Forum Members
Last Login: Today @ 6:30 PM
Points: 18,733,
Visits: 12,330
Thanks for the question
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #843316
brdudley
brdudley
Posted Thursday, January 07, 2010 12:00 AM
Ten Centuries
Group: General Forum Members
Last Login: 2 days ago @ 9:20 AM
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This help page lists the logical operators (http://msdn.microsoft.com/en-us/library/ms189773(SQL.90).aspx) including IN.
I don't doubt that an entire clause containing IN is a predicate, but perhaps IN is the operator in the predicate.
Post #843336
BudaCli
BudaCli
Posted Thursday, January 07, 2010 12:20 AM
Ten Centuries
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Last Login: Wednesday, March 27, 2013 9:02 AM
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Also thaught that a logical operator is correct but a lil explanation will be more apreciated from this side.
What you don't know won't hurt you but what you know will make you plan to know better
Post #843340
optradba
optradba
Posted Thursday, January 07, 2010 12:39 AM
Mr or Mrs. 500
Group: General Forum Members
Last Login: Yesterday @ 1:09 AM
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BOL says that IN is a logical operator. Can you please explain why you considered it as a Predicate? Since most of us answered it "wrong", I think we deserved an explanation, right?
Post #843350
Chris Hamam
Chris Hamam
Posted Thursday, January 07, 2010 1:36 AM
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Group: General Forum Members
Last Login: Tuesday, April 23, 2013 3:29 PM
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brdudley (1/7/2010)
This help page lists the logical operators (http://msdn.microsoft.com/en-us/library/ms189773(SQL.90).aspx) including IN.
I don't doubt that an entire clause containing IN is a predicate, but perhaps IN is the operator in the predicate.
I agree - IN is technically the logical
operator
that exists within an
expression
, which then creates a predicate.
IN by itself certainly does not return anything at all - neither TRUE, nor FALSE, nor UNKNOWN - it would be a syntax error if that was used on it's own.
<predicate> ::=
{ expression { = | < > | ! = | > | > = | ! > | < | < = | ! < } expression
| string_expression [ NOT ] LIKE string_expression
[ ESCAPE 'escape_character' ]
| expression [ NOT ] BETWEEN expression AND expression
| expression IS [ NOT ] NULL
| CONTAINS
( { column | * } , '< contains_search_condition >' )
| FREETEXT ( { column | * } , 'freetext_string' )
| expression [ NOT ] IN ( subquery | expression [ ,...n ] )
| expression { = | < > | ! = | > | > = | ! > | < | < = | ! < }
{ ALL | SOME | ANY} ( subquery )
| EXISTS ( subquery ) }
Source:
http://msdn.microsoft.com/en-us/library/ms173545%28SQL.90%29.aspx
--Chris Hamam
Life's a beach, then you DIE
(Do It Eternally)
Post #843367
Christian Buettner-167247
Christian Buettner-167247
Posted Thursday, January 07, 2010 1:37 AM
SSCrazy
Group: General Forum Members
Last Login: Thursday, May 16, 2013 3:36 AM
Points: 2,522,
Visits: 3,616
I agree that the given answer is wrong.
IN is an
operator
but can be used in an
expression
like "a IN (1,2,3)".
The
expression
in this case is a
predicate
, and
IN
is the
operator
used in the
predicate
.
Best Regards,
Chris Büttner
Post #843368
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Thursday, January 07, 2010 1:52 AM
Hall of Fame
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Last Login: 2 days ago @ 1:49 AM
Points: 3,123,
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Agree with previous posts.
IN, like all logical operators, must form part of an expression.
A predicate may comprise one or more logical operators (albeit in a join or where)
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #843378
chriscoates
chriscoates
Posted Thursday, January 07, 2010 2:41 AM
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Last Login: Friday, November 09, 2012 7:25 AM
Points: 298,
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I agree with the previous posts. A little more justification for the answer please.
Also, I'm sure that I've seen my execution plans change
WHERE colA IN(1)
into
WHERE colA=1
and
WHERE colA IN(1,2,3)
into
WHERE colA=1 OR colA=2 OR colA=3
Though to be honest, I can't replicate that right now. I might have seen it running a trace at some point.
It does highlight how SQL tests a value in 2 columns though:
WHERE 1 in(colA,colB)
turns into
WHERE 1=colA OR 1=colB
Post #843388
Muhammad Haseeb Farhan
Muhammad Haseeb Farhan
Posted Thursday, January 07, 2010 2:44 AM
SSC Veteran
Group: General Forum Members
Last Login: Wednesday, February 13, 2013 7:13 AM
Points: 256,
Visits: 223
Agree with Christian Buettner ... IN is the operator used in the predicate.
Post #843391
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